It's been a hot month for claims about climate change

n May, the White House released the National Climate Assessment, which concluded that South Florida is "exceptionally vulnerable" to risks from man-made climate change including rising seas, more extreme heat and dropping water supplies.

The report, written by a committee of 60 scientists, named Miami as one of the most vulnerable cities. Coincidentally, two of the GOP presidential contenders live in cities neighboring Miami: U.S. Sen. Marco Rubio and former Gov. Jeb Bush.

Separately, two science papers released in May reported that the global sea level will rise at least 10 feet, accelerating to a dangerous pace after the next century.

The reports sparked some much-publicized comments by politicians and pundits, making climate change a hot issue in elections this fall in some states.

Tom Steyer, a billionaire environmental activist from California, plans to spend tens of millions this year through his PAC NextGenClimate to attack candidates that are skeptical about climate change, including Florida Gov. Rick Scott, who is expected to face former Gov. Charlie Crist in November.